106 lines
2.3 KiB
Go
106 lines
2.3 KiB
Go
package services
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import (
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"database/sql"
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"fmt"
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_ "github.com/lib/pq"
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"go-weather/models"
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"time"
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)
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func ConnectDB(connStr string) (*sql.DB, error) {
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db, err := sql.Open("postgres", connStr)
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if err != nil {
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return nil, fmt.Errorf("failed to connect to db: %v", err)
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}
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err = db.Ping()
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if err != nil {
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return nil, fmt.Errorf("failed to connect to db: %v", err)
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}
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fmt.Println("connected to PostgreSQL")
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return db, nil
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}
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type DatabaseService struct {
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db *sql.DB
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}
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func NewDatabaseService(db *sql.DB) *DatabaseService {
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return &DatabaseService{db: db}
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}
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func (s *DatabaseService) CreateTable() error {
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_, err := s.db.Exec(`
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CREATE TABLE IF NOT EXISTS weather_readings (
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id SERIAL PRIMARY KEY,
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city TEXT NOT NULL,
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temp DOUBLE PRECISION NOT NULL,
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feels_like DOUBLE PRECISION NOT NULL,
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humidity INTEGER NOT NULL,
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conditions TEXT NOT NULL,
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fetched_at TIMESTAMP WITH TIME ZONE NOT NULL
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)
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`)
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if err != nil {
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fmt.Errorf("failed to create table: %v", err)
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}
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fmt.Println("weather_readings table ready")
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return nil
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}
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func (s *DatabaseService) SaveReading(weather models.WeatherResponse) (int, error) {
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conditions := ""
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if len(weather.Weather) > 0 {
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conditions = weather.Weather[0].Description
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}
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var id int
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err := s.db.QueryRow(
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`INSERT INTO weather_readings (city, temp, feels_like, humidity, conditions, fetched_at)
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VALUES ($1, $2, $3, $4, $5, $6)
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RETURNING id`,
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weather.Name,
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weather.Main.Temp,
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weather.Main.FeelsLike,
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weather.Main.Humidity,
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conditions,
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time.Now(),
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).Scan(&id)
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if err != nil {
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return 0, fmt.Errorf("failed to save reading: %w", err)
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}
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return id, nil
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}
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func (s *DatabaseService) GetReadings(city string, limit int) ([]models.Reading, error) {
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rows, err := s.db.Query(
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`SELECT id, city, temp, feels_like, humidity, conditions, fetched_at
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FROM weather_readings
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WHERE city ILIKE $1
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ORDER BY fetched_at DESC
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LIMIT $2`,
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city, limit,
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)
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if err != nil {
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return nil, fmt.Errorf("Query failed: %w", err)
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}
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defer rows.Close()
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var readings []models.Reading
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for rows.Next() {
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var r models.Reading
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err := rows.Scan(&r.ID, &r.City, &r.Temp, &r.FeelsLike, &r.Humidity, &r.Conditions, &r.FetchedAt)
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if err != nil {
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return nil, fmt.Errorf("scan failed: %w", err)
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}
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readings = append(readings, r)
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}
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return readings, nil
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}
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